Lol people, he hasnt been into PC games since Diablo 2 and You are recommending him one year old indie games? Jesus.
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For RTS games:
Supreme Commander
World in Conflict
Star Control 2
Earth series 2140/2150/2160
Empire Earth series
Rise of Nations
Anno series
Magic and Mayhem
Warhammer: Dark Omen
Total War series
Battle Realms [one of the better RTS ever made and so underrated]
Homeworld series
Command and Conquer Generals
Spellforce series
Warrior Kings
For strategy games:
Tropico series
Trade Empires
Tycoon series
Europa Universalis series
Hearts of Iron
Black and White
Etherlords
Age of Wonders
Sid Meier's Pirates!
Dungeon Keeper 2 !!!
Simcity series
Different kind of RTS games:
Sacrifice
Giant Citizen Kabuto
Mount and Blade
4X games
Galactic Civilizations series
Space Empires 4 and 5
X series [X3 Terran Conflict, Reunion and Albion Prelude]
Freespace
Nexus
Sins of Solar Empires
RPGs:
Vampire: The Masquerade - Bloodlines
Elders Scrolls: Morrowind
Might and Magic series [awesome topic about similar games
http://www.neogaf.com/forum/showthread.php?t=469298]
Neverwinter Nights series
Knights of The Old Republic 1 and 2
Gothic series
Drakensang series
Other games:
Jedi Knight series, especially Jedi Outcast and Jedi Academy
Thief series
Dark Messiah of Might and Magic
Arx Fatalis
more TPS shooters, but unique ones
Max Payne series
Psi Ops
Messiah
Oni
Thats all i remember right now.